Having problems with Red Max 2601 Trimmer

I have been through 3 spark plugs in 4 months.
I'm running valvoline 2-cycle @ 50 : 1 and NKG plug.
It get used for both trimming a few large ditches and embankments
with throttle locked and small yards reving up and down. One plug went
in 2 weeks. Its was a little black but I easily got it clean w/wire brush,
but plug was still shot. Do I need a hotter plug? Different oil?

I have been through 3 spark plugs in 4 months.
I'm running valvoline 2-cycle @ 50 : 1 and NKG plug.. Do I need a hotter plug? Different oil?

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I would change to either redmax brand oil or Stens. Funny thing I've found out about spark plugs, some work better in different engines. Try a Champion CJ 8. If those two things don't help, it could be the carb is running rich

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Masters Degree in Thinking Out Side Of The Box,Graduate of the MacGyver Institute of Ingenuity

The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic

i have the same trimmer and have had trouble fouling plugs. However, I found out that I was mixing my oil too rich (about 35:1). I was just refilling the small shindaiwa bottles, but I was filling too full. I replaced the plug and haven't had trouble since. I have noticed however that it gives more problems when not running unit at full throttle.